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Two blocks of equal mass m are connected...

Two blocks of equal mass `m` are connected by an unstretched spring and the system is kept at rest on a frictionless horizontal surface. A constant force `F` is applied on the first block pulling away from the other as shown in Fig.

If the extension of the spring is `x_(0)` at time `t`, then the displacement of the first block at this instant is

A

`1/2((Ft^(2))/(2m)+xx_(0))`

B

`((Ft^(2))/(2m)-xx_(0))`

C

`1/2((Ft^(2))/(2m)-xx_(0))`

D

`((Ft^(2))/(2m)+xx_(0))`

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